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Stock-Based Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Summary Of Stock Option Activity
A summary of the Company's stock option activity for the six months ended June 30, 2020 and June 30, 2019 is presented below:
Stock Options
Common
Shares
 
Weighted
Average
Strike Price
 
Remaining
Contractual
Term (1)
 
Intrinsic
Value (2)
($000)
Outstanding at January 1, 2020
755,332

 
$
42.43

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(98,659
)
 
38.75

 
 
 
 
Forfeited or canceled
(648
)
 
46.86

 
 
 
 
Outstanding at June 30, 2020
656,025

 
$
42.98

 
2.2
 
$
970

Exercisable at June 30, 2020
648,124

 
$
42.97

 
2.2
 
$
957

Stock Options
Common
Shares
 
Weighted
Average
Strike Price
 
Remaining
Contractual
Term (1)
 
Intrinsic
Value (2)
($000)
Outstanding at January 1, 2019
795,014

 
$
42.25

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(94,767
)
 
38.00

 
 
 
 
Forfeited or canceled
—

 
—

 
 
 
 
Outstanding at June 30, 2019
700,247

 
$
42.83

 
2.7
 
$
21,239

Exercisable at June 30, 2019
685,127

 
$
42.80

 
2.7
 
$
20,802


(1)
Represents the remaining weighted average contractual life in years.
(2)
Aggregate intrinsic value represents the total pre-tax intrinsic value (i.e., the difference between the Company's stock price on the last trading day of the quarter and the option exercise price, multiplied by the number of shares) that would have been received by the option holders if they had exercised their options on the last day of the quarter. Options with exercise prices above the stock price on the last trading day of the quarter are excluded from the calculation of intrinsic value. The intrinsic value will change based on the fair market value of the Company's stock.
Summary Of Plans' Restricted Share And Performance-Vested Stock Award Activity
A summary of the Plans' restricted share activity for the six months ended June 30, 2020 and June 30, 2019 is presented below:
 
Six months ended June 30, 2020
 
Six months ended June 30, 2019
Restricted Shares
Common
Shares

Weighted
Average
Grant-Date
Fair Value

Common
Shares

Weighted
Average
Grant-Date
Fair Value
Outstanding at January 1
144,328

 
$
60.37

 
143,263

 
$
60.80

Granted
106,139

 
62.53

 
11,121

 
72.01

Vested and issued
(12,099
)
 
76.98

 
(13,401
)
 
76.29

Forfeited or canceled
(4,162
)
 
79.22

 
(1,158
)
 
78.36

Outstanding at June 30
234,206

 
$
60.16

 
139,825

 
$
60.06

Vested, but not issuable at June 30
92,910

 
$
52.14

 
91,148

 
$
52.08


A summary of the Plans' performance-based stock award activity, based on the target level of the awards, for the six months ended June 30, 2020 and June 30, 2019 is presented below:
 
Six months ended June 30, 2020
 
Six months ended June 30, 2019
Performance-based Stock
Common
Shares
 
Weighted
Average
Grant-Date
Fair Value
 
Common
Shares
 
Weighted
Average
Grant-Date
Fair Value
Outstanding at January 1
465,515

 
$
74.37

 
396,855

 
$
67.71

Granted
169,642

 
63.65

 
174,187

 
71.58

Added by performance factor at vesting
48,831

 
72.59

 
33,950

 
40.99

Vested and issued
(180,789
)
 
72.59

 
(128,238
)
 
41.00

Expired, canceled or forfeited
(8,666
)
 
72.74

 
(6,590
)
 
72.96

Outstanding at June 30
494,533

 
$
71.19

 
470,164

 
$
74.43

Vested, but deferred at June 30
34,219

 
$
43.07

 
33,570

 
$
42.84